Toshiba dvd rom sd r6012 isn't reading the DVDs
Try some factory CD and DVDs and just try to get them to open in Windows (not play in a media player program). If you get errors on every disc you try, it may be your CD/DVD hardware packing in.
If it reads some CDs or DVDs and not others, particularly media discs, you may be having software driver problems, otherwise, it is likely hardware.
Try inserting the disc and spinning it up while resting the laptop on its side, or even upside down. If it reads sideways or upside down, the CD/DVD reader hardware has gone and cannot probably be prepared (this is a symptom of physical controller failure and is ot fixable by normal means).